@@ -328,6 +328,12 @@ config MTD_OOPS
To use, add console=ttyMTDx to the kernel command line,
where x is the MTD device number to use.
+config MTD_RUNTIME_BADBLOCK_CHECK
+ bool "Runtime badblock check support"
+ depends on MTD
+ help
+ This enables check badblocks at access time.
+
source "drivers/mtd/chips/Kconfig"
source "drivers/mtd/maps/Kconfig"
@@ -485,6 +485,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
}
slave->mtd.ecclayout = master->ecclayout;
+
+#ifndef CONFIG_MTD_RUNTIME_BADBLOCK_CHECK
if (master->block_isbad) {
uint64_t offs = 0;
@@ -495,6 +497,7 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
offs += slave->mtd.erasesize;
}
}
+#endif
out_register:
/* register our partition */
@@ -1536,6 +1536,7 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
int ret = 0, readcmd;
size_t len = ops->ooblen;
u_char *buf = ops->oobbuf;
+ int update = 0;
DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %zi\n",
__func__, (unsigned int) from, len);
@@ -1550,13 +1551,15 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
return ONENAND_BBT_READ_FATAL_ERROR;
}
- /* Grab the lock and see if the device is available */
- onenand_get_device(mtd, FL_READING);
-
column = from & (mtd->oobsize - 1);
readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
+ if (this->options & ONENAND_RUNTIME_BADBLOCK_CHECK) {
+ readcmd = ONENAND_CMD_READ;
+ update = 1;
+ }
+
while (read < len) {
cond_resched();
@@ -1565,7 +1568,7 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
this->command(mtd, readcmd, from, mtd->oobsize);
- onenand_update_bufferram(mtd, from, 0);
+ onenand_update_bufferram(mtd, from, update);
ret = this->bbt_wait(mtd, FL_READING);
if (unlikely(ret))
@@ -1589,9 +1592,6 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
}
}
- /* Deselect and wake up anyone waiting on the device */
- onenand_release_device(mtd);
-
ops->oobretlen = read;
return ret;
}
@@ -3,11 +3,17 @@
*
* Bad Block Table support for the OneNAND driver
*
- * Copyright(c) 2005 Samsung Electronics
+ * Copyright(c) 2005-2010 Samsung Electronics
* Kyungmin Park <kyungmin.park@samsung.com>
*
* Derived from nand_bbt.c
*
+ * Legend in badblock table:
+ * 0x00 Normal
+ * 0x01 RESERVED
+ * 0x02 Used for runtime badblock check
+ * 0x03 Bad block (initial or runtime)
+ *
* TODO:
* Split BBT core and chip specific BBT.
*/
@@ -17,6 +23,16 @@
#include <linux/mtd/onenand.h>
#include <linux/mtd/compatmac.h>
+#define BBT_NORMAL_BITS 0x00
+#define BBT_RUNTIME_BADBLOCK_BITS 0x02
+#define BBT_BADBLOCK_BITS 0x03
+
+#ifdef CONFIG_MTD_RUNTIME_BADBLOCK_CHECK
+#define BBT_SCAN_PAGE 1
+#else
+#define BBT_SCAN_PAGE 2
+#endif
+
/**
* check_short_pattern - [GENERIC] check if a pattern is in the buffer
* @param buf the buffer to search
@@ -44,6 +60,52 @@ static int check_short_pattern(uint8_t *buf, int len, int paglen, struct nand_bb
}
/**
+ * read_page_oob - [GENERIC] Read oob for runtime badblock check
+ * @param mtd MTD device structure
+ * @param from the length of buffer to search
+ * @param buf temporary buffer
+ *
+ * Read page oob at runtime badblock check
+ */
+static int read_page_oob(struct mtd_info *mtd, loff_t from, u_char *buf)
+{
+ struct onenand_chip *this = mtd->priv;
+ struct bbm_info *bbm = this->bbm;
+ struct nand_bbt_descr *bd = bbm->badblock_pattern;
+ struct mtd_oob_ops ops;
+ int ret, scanlen, block, j, res;
+
+ scanlen = 0;
+
+ ops.mode = MTD_OOB_PLACE;
+ ops.ooblen = 32;
+ ops.oobbuf = buf;
+ ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
+
+ /* Get block number * 2 */
+ block = (int) ((from >> this->erase_shift) << 1);
+
+ /* Set normal block first */
+ res = BBT_NORMAL_BITS;
+ bbm->bbt[block >> 3] &= ~(0x3 << (block & 0x6));
+ bbm->bbt[block >> 3] |= res << (block & 0x6);
+
+ for (j = 0; j < BBT_SCAN_PAGE; j++) {
+ ret = onenand_bbt_read_oob(mtd, from + j * mtd->writesize + bd->offs, &ops);
+ if (ret || check_short_pattern(&buf[j * scanlen], scanlen, mtd->writesize, bd)) {
+ res = BBT_BADBLOCK_BITS;
+ bbm->bbt[block >> 3] |= res << (block & 0x6);
+ printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
+ block >> 1, (unsigned int) from);
+ mtd->ecc_stats.badblocks++;
+ break;
+ }
+ }
+
+ return res;
+}
+
+/**
* create_bbt - [GENERIC] Create a bad block table by scanning the device
* @param mtd MTD device structure
* @param buf temporary buffer
@@ -67,7 +129,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
printk(KERN_INFO "Scanning device for bad blocks\n");
- len = 2;
+ len = BBT_SCAN_PAGE;
/* We need only read few bytes from the OOB area */
scanlen = ooblen = 0;
@@ -99,7 +161,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
return -EIO;
if (ret || check_short_pattern(&buf[j * scanlen], scanlen, mtd->writesize, bd)) {
- bbm->bbt[i >> 3] |= 0x03 << (i & 0x6);
+ bbm->bbt[i >> 3] |= BBT_BADBLOCK_BITS << (i & 0x6);
printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
i >> 1, (unsigned int) from);
mtd->ecc_stats.badblocks++;
@@ -152,6 +214,11 @@ static int onenand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
block = (int) (onenand_block(this, offs) << 1);
res = (bbm->bbt[block >> 3] >> (block & 0x06)) & 0x03;
+ if (this->options & ONENAND_RUNTIME_BADBLOCK_CHECK) {
+ if (res == BBT_RUNTIME_BADBLOCK_BITS)
+ res = read_page_oob(mtd, offs, this->page_buf);
+ }
+
DEBUG(MTD_DEBUG_LEVEL2, "onenand_isbad_bbt: bbt info for offs 0x%08x: (block %d) 0x%02x\n",
(unsigned int) offs, block >> 1, res);
@@ -201,6 +268,12 @@ int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
if (!bbm->isbad_bbt)
bbm->isbad_bbt = onenand_isbad_bbt;
+ if (this->options & ONENAND_RUNTIME_BADBLOCK_CHECK) {
+ printk(KERN_INFO "Scanning device for bad blocks (skipped)\n");
+ memset(bbm->bbt, 0xAA, len);
+ return 0;
+ }
+
/* Scan the device to build a memory based bad block table */
if ((ret = onenand_memory_bbt(mtd, bd))) {
printk(KERN_ERR "onenand_scan_bbt: Can't scan flash and build the RAM-based BBT\n");
@@ -181,6 +181,7 @@ struct onenand_chip {
#define ONENAND_HAS_2PLANE (0x0004)
#define ONENAND_HAS_4KB_PAGE (0x0008)
#define ONENAND_SKIP_UNLOCK_CHECK (0x0100)
+#define ONENAND_RUNTIME_BADBLOCK_CHECK (0x0200)
#define ONENAND_PAGEBUF_ALLOC (0x1000)
#define ONENAND_OOBBUF_ALLOC (0x2000)